Design & Specifications
Winchester had been manufacturing the shortened Holland & Holland cases under a contract for Weatherby for use in their .257 Weatherby Magnum, .270 Weatherby Magnum and 7mm Weatherby Magnum cartridges. While the Weatherby cases had been based on the Winchester's .30 Super cartridge, these new series of shortened Holland & Holland cases were based on the .375 Holland & Holland case which was more plentiful and hence more available. The advantages of the shortened case were two fold: the cartridge could function through the easily available standard length rifle action used by the .30-06 Springfield and the .270 Winchester and was close to the efficiency limitations of powders available at the time given the case capacity of the cartridge. Using the longer, full length .375 H&H case would not have produced a great performance benefit given the powders available. This was also the reasoning behind the shortened cases used by Weatherby as DuPont's IMR 4350 had been the slowest burning powder available at the time.
The .264 Winchester Magnum is a cartridge which was standardized by SAAMI, which published recommended specifications for the cartridge. SAAMI recommends a six groove barrel with a rate of twist of one revolution in 9 in (230 mm), a bore diameter of .256 in (6.5 mm) and a groove diameter of .264 in (6.7 mm) with each groove having a width of 0.090 in (2.3 mm). The recommended maximum pressure for the cartridge (pizeo) is 64,000 psi (4,400 bar).
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